Thermal expansion of oceans may lead to

As oceans warm, the water expands in volume, and this thermal expansion raises sea levels.

Global warming is the cause of the expansion, not the effect described here.

Ozone depletion is a separate stratospheric problem unrelated to ocean expansion.

Melting glaciers add water to the oceans but are distinct from expansion of existing water.

The direct outcome of warmer, expanding seawater is a higher sea level.

Thermal expansion and ice melt together are the main drivers of modern sea level rise.